1998 Volume 7 Issue 7 Pages 445-449
Inflammatory pseudotumor of the orbit (IPO), also labeled nonspecific orbital inflammation, is the third most common cause of unilateral exophthalmos in adults. Affected individuals usually experience the abrupt onset of painful proptosis with chemosis, eyelid, edema, and limitation of gaze. This paper reports a case of IPO, which represented unusually long clinical course. A 40-year-old man was seen in our clinic because of the deteriorating left expophthalmos for 6 years. CT scan revealed an intraorbital mass with exophthalmos. MRI also demonstrated a dumbbell shaped mass in the orbital apex. To differentiate neoplastic lesions, open biopsy was performed via the left fronto temporal craniotomy. Histological examination showed the evidence of IPO-lymphocytic infiltration. He satisfactory responded to oral corticosteroid treatment. Eleven months after the treatment, he showed no exophthalmos.
